Conformational signatures induced by ubiquitin modification in the amyloid-associated tau repeat domain

Gabriele Giachin.

SASDV76 – Microtubule-associated protein tau, lysine-rich four-repeat domain 4RD synthetically linked to two Ubiquitins at tau residues C311 and C317

Isoform Tau-F of Microtubule-associated protein tau (C291A, K311C, K317C, C322A)
Polyubiquitin-B
Polyubiquitin-B
MWexperimental 34 kDa
MWexpected 31 kDa
VPorod 59 nm3
log I(s) 3.28×10-1 3.28×10-2 3.28×10-3 3.28×10-4
Isoform Tau-F of Microtubule-associated protein tau (C291A, K311C, K317C, C322A) Polyubiquitin-B Polyubiquitin-B small angle scattering data  s, nm-1
ln I(s)
Isoform Tau-F of Microtubule-associated protein tau (C291A, K311C, K317C, C322A) Polyubiquitin-B Polyubiquitin-B Guinier plot ln 3.29×10-1 Rg: 3.3 nm 0 (3.3 nm)-2 s2
(sRg)2I(s)/I(0)
Isoform Tau-F of Microtubule-associated protein tau (C291A, K311C, K317C, C322A) Polyubiquitin-B Polyubiquitin-B Kratky plot 1.104 0 3 sRg
p(r)
Isoform Tau-F of Microtubule-associated protein tau (C291A, K311C, K317C, C322A) Polyubiquitin-B Polyubiquitin-B pair distance distribution function Rg: 3.4 nm 0 Dmax: 12.2 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Microtubule-associated protein tau, lysine-rich four-repeat domain 4RD synthetically linked to two Ubiquitins at tau residues C311 and C317 Rg histogram Rg, nm
Isoform Tau-F of Microtubule-associated protein tau (C291A, K311C, K317C, C322A) Polyubiquitin-B Polyubiquitin-B EOM/RANCH model

log I(s)
 s, nm-1
Isoform Tau-F of Microtubule-associated protein tau (C291A, K311C, K317C, C322A) Polyubiquitin-B Polyubiquitin-B AMBER model

Synchrotron SAXS data from solutions of microtubule-associated protein tau (lysine-rich four-repeat domain 4RD) synthetically linked to two ubiquitins at tau amino acids C311 and C317 in 100 mM NaCl, pH 6.8 were collected on the EMBL P12 beam line at PETRA III (DESY; Hamburg, Germany) using a Pilatus 6M detector at a sample-detector distance of 3 m and at a wavelength of λ = 0.123972 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). One solute concentration of 8.00 mg/ml was measured at 20°C. 20 successive 0.050 second frames were collected. The data were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted.

Isoform Tau-F of Microtubule-associated protein tau (C291A, K311C, K317C, C322A) (tau4RD domain)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Monomer
Mon. MW   13.7 kDa
 
UniProt   P10636-8 (244-372)
Sequence   FASTA
 
Polyubiquitin-B
Mol. type   Protein
Organism   Fukomys damarensis
Olig. state   Monomer
Mon. MW   8.7 kDa
 
UniProt   A0A091E260 (1-77)
Sequence   FASTA
 
Polyubiquitin-B
Mol. type   Protein
Organism   Fukomys damarensis
Olig. state   Monomer
Mon. MW   8.7 kDa
 
UniProt   A0A091E260 (1-77)
Sequence   FASTA